USB: serial: cp210x: add gpio-configuration debug printk

Add a debug printk to dump the GPIO configuration stored in EEPROM
during probe.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ceb3a65..ee595d1 100644 (file)
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1543,10 +1543,16 @@ static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
 {
        struct usb_serial *serial = gpiochip_get_data(gc);
        struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+       struct device *dev = &serial->interface->dev;
        unsigned long altfunc_mask = priv->gpio_altfunc;
 
        bitmap_complement(valid_mask, &altfunc_mask, ngpios);
 
+       if (bitmap_empty(valid_mask, ngpios))
+               dev_dbg(dev, "no pin configured for GPIO\n");
+       else
+               dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
+                               valid_mask);
        return 0;
 }